Automatic power cut-off.



0.1. Hana, AUTOMATIC POWER CUT-OFF. APPLICATION FILEDDCT- l4, l9l3-.

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Patented J M66, 1916.

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AUTOMATIC POWER CUT-OFF.

Specification of Letters Patent.

Patented June a, rare.

Application filed October 14, 1913. Serial No. 795,137.

To all whom it may concern:

Be it known that I, GEORGE J. HELY, a citizen of Persia,.and a residentof Seattle,

" in the county of King and State of Washington, have invented certainnew and useful Improvements in Automatic Power Cut- Ofls, of which thefollowing is a specification.

This invention relates to conveyors, and has for its principal object toprovide avery simple, durable form of conveyer and its actuating means,wherein the poweris automatically cut off whenever the conveyer becomesloaded to a degree which is suliiciently below the breaking point of the.conveyer chain, or other such member, to insure that no damage willresult to the conveyer chain due to overloading thereof.

Other objects and features Wlll appear as the invention is more fullydescribed in the following specification, illustrated in theaccompanying drawings, and pointed out in the appended claims.

In the drawings, Figure 1, is a plan view of my device, partly brokenaway Fig. 2, is a similar view in side elevation.

Referringnow more particularly to the drawings, reference numeral 1designates the bed of the device, upwardly extending from which are therisers 2, which are joined by the cross timber 4 upon which is supportedone end of the chute 3, as plainly shown in the drawings, which issupported at suitable intervals by the brackets 4, upon the horses 4,upon one of which are the bearings 5, in.which is mounted the shaft 5 ofthe pulley 5*, over which runs the endless conveyer, which, in thisinstance, is in the form of the belt 6, which also passes around thepulley 7, whose shaft 8 is revolubly mounted in the bearings 9, fixed tothe bed 1. Fixed to the bed 1 isthe motor 10, the shaft 11 of whichterminates in the sleeve 12, the opening in which sleeve is angular asviewed from its end, and into which loosely fits the shank 13, which isangular in cross section. The

shaft 14, which is integral with the shank 13, is revolubly mounted inthe bearings 15 fixed to the bed 'l, and upon the said shaft is the worm16 which meshes with the worm wheel 17 fixed to the shaft 8. Upon theshaft 14" are fixed the collars 18, between which is one end of a switch19, pivoted at 20, to the bracket 21, fixed to the bed 1. The oppositeend of the said switch is adapted to contact with the two plates22,fixed to the said bracket, to complete the electrical circuit of thepositive and negative wires 23 and 24 of the motor 10. Upon one end ofthe shaft 14 is the male member 25 of the clutch which cooperates withthe female member 26, fixed to the friction pulley 27 which is looseupon the shaft 14. Upon the left hand end of the said shaft is thehelical spring 28, confined between the two washers 29 and 30, theformer of which is'fixed to the shaft 14 and the latter is loosethereon. Formed upon one of the bearings 15 is the washer 31, in which,as well as the washer 29, may be a ball race for the anti-friction balls32.

33 indicates a battery within whose electrical circuit, indicated by thewire 34, is

the bell 35, and the said circuit is adapted to be opened and closed-bymeans of the switch 36, which extends from the switch 19.

When the switch 19 is in its position, as shown in the drawings, and themotor 10 is running the shaft 14, through the sleeve 12, is rotated,and, through the worm 16 and its wheel 17, the. conveyor belt 6 is setin motion. It is clear that if the said belt be loaded to suoli idegreethat the power transmitted from thesaid motor is no longer sufficient toturn the wheel 17, the latter comes to rest, but the shaft 14 willcontinue to revolve, which, through the coiiperation of the worm 16 andthe now stationary wheel 17, causes thesaid shaft to advance itselflongitudinally in its bearings, which moves the end of the switch 19which is between the collars 18, about the pivot 20 until the oppositeend of the said switch no longer connects the plates 22, which, ofcourse, interrupts the electrical circuit from the motor 10 and causesit to. stop. During the movement of the switch 19, just described, it isclear that the switch 36 has been so moved as to complete the circuitfrom the battery 33 and has caused the bell 35 to ring.

If the conveyer be run byother means than the motor 10, a suitable beltsuch asindicated at 37, may connect the engine 38 with the wheel 27 andthe power be thus transmitted to the shaft 14 and its connections.Whether power be applied by means of the motor 10 or from a differentsource,

cerned. If the power be applied through the wheel 27, the longitudinalmovement of the shaft 14 withdraws the male portion 25 from the femaleportion 26 of the clutch mechanism, thus shutting off the power andcausing the bell 36 to ring. While the bell, or some other such alarm isa desirable element, it is not absolutely necessary, of course, becausethe stoppage of the conveyer belt would be in itself usually quicklyapparent to the laborers or other attendants in the vicinity of theconveyer.

While I have shown a particular form of embodiment of my invention, I amaware that many changes therein may readily suggest themselves to othersskilled in the art, without departing from the spirit and scope of theinvention, and I do not therefore desire to be limited to the exact formhereinabove described and shown in the accompanying drawings.

Vhat I claim as new and desire to protect by Letters Patent is:

1. The combination with a driven element and its source of power, oftransmission means which include a worm wheel, a shaft having a wormintegral therewith, a pulley which normally rotates with the shaft,whereby when the said worm wheel becomes stationary the said shaft has asliding movement with respect to the said worm wheel and the said pulleyis released from operative engagement with the said shaft.

2. The combination with a driven element and its source of power, of aworm wheel for driving the said element, a shaft having a worm integraltherewith, which is adapted to move longitudinally when the said Wheelbecomes stationary and the said shaft continues to rotate, a clutchwhich becomes inoperative automatically, due to the movement of the saidshaft, whereby the power is automatically shut off when the said drivenelement is loaded sufiiciently to stop the said worm wheel. v

3. The combination with a driven element and its source of power, ofpower transmission means between the said element and its said source ofpower which includes a shaft having a worm integral therewith and apulley normally rotatable with said shaft and which has an automaticmovement independent of the said element, and means which is broughtinto action by the stopping of the said element and the continuedrotation of the said shaft to rotatably disconnect the said pulley fromthe said shaft.

4. In a device of the class described, the combination with a drivenelement and a source of power, of a worm wheel for driving the saidelement, a worm secured to its worm shaft, the said worm cooperatingwiththe worm wheel and the said worm arid its shaft being slidablelongitudinally under the thrusting influence of the worm wheel, a pulleyslidably mounted on said worm shaft, and a clutch secured to the wormshaft and normally cooperating with the said pulley and securing itrotatively with said shaft.

GEORGE J HELY. Witnesses:

MAY L. GORDON, R. D. S ALLEY.

